Blue stars are incredibly hot! They have surface temperatures ranging from 10,000 to 50,000 Kelvin (K).

Here's a breakdown:

* 10,000 K: This is the lower end of the temperature range for blue stars. Stars at this temperature still appear blue, but they are closer to white-blue.

* 50,000 K: This is the upper end of the temperature range. Stars at this temperature are incredibly hot and bright, emitting a very intense blue light.

To put these temperatures into perspective:

* The surface of our Sun is about 5,500 K.

* Water boils at 373 K.

* Absolute zero (the coldest possible temperature) is 0 K.

So, blue stars are significantly hotter than our Sun and even hotter than the boiling point of water!